Did you even read my post? I don't think Redden is worth pick 17 on current form, so continuing to bring him up is pointless.
The fact that you feel the trade for Redden was a massive overpay, should also mean that a similar pick for Barlow is a massive over pay. Their stats are similar (see my link), and value should also be similar when allowing for the fact that Barlow slight better stats are offset by him being 3 years older.
Again, I do not think Redden (based on current form) is worth what we paid, nor do I think Barlow is worth what you are suggesting. I am not sure what the eagles traded for Redden has to do with the value of Barlow? Everyone would agree that the Redden trade so far has not provided value. And based on the stats provided and taking into account their age, I cant see how you can value Barlow substantially more than Redden.
But I digress, that's your opinion, and you are entitled to it, but I would not be holding hope that Barlow will return you anywhere near pick 17, or an early second rounder. The proof will be in the pudding.
The club should either sign him, or let him go where he wants for some nominal draft pick.